5 Signal Descriptions List

The following tables provide the details on signal names classified by the peripheral.

Table 5-1. Signal Descriptions List
Signal Name	Function	Type
Analog Comparators (AC)
AIN[7:0]	AC Comparator Inputs	Analog Input
CMP[3:0]	AC Comparator Outputs	Digital Output
Analog-to-Digital Converter (ADCx)
AIN[11:0]	ADC Input Channels	Analog Input
VREFA	ADC Voltage External Reference A	Analog Input
Digital-to-Analog Converter (DAC)
VOUT	DAC Voltage output	Analog Output
VREFA	DAC Voltage External Reference A	Analog Input
External Interrupt Controller (EIC)
EXTINT[15:0]	External Interrupt Pins	Digital Input
NMI	External Non-Maskable Interrupt Pin	Digital Input
Generic Clock Generator (GCLK)
GCLK_IO[7:0]	Generic Clock (source clock inputs or generic clock generator output)	Digital I/O
Custom Control Logic (CCL)
IN[11:0]	Logic Inputs	Digital Input
OUT[3:0]	Logic Outputs	Digital Output
Power Manager (PM)
RESET	External Reset Pin (Active Level: LOW)	Digital Input
Serial Communication Interface (SERCOMx)
PAD[3:0]	SERCOM Inputs/Outputs Pads	Digital I/O
Oscillators Control (OSCCTRL)
XIN	Crystal or external clock Input	Analog Input (Crystal Oscillator)/Digital Input (External Clock)
XOUT	Crystal Output	Analog Output
32.768 kHz Oscillators Control (OSC32KCTRL)
XIN32	32.768 kHz Crystal Oscillator or External Clock Input	Analog Input (Crystal Oscillator)/Digital Input (External Clock)
XOUT32	32.768 kHz Crystal Oscillator Output	Analog Output
Timer Counter (TCx)
WO[1:0]	Waveform/PWM Outputs / Capture Inputs	Digital I/O
Timer Counter (TCCx)
WO[7:0]	Waveform/PWM Outputs	Digital I/O
Peripheral Touch Controller (PTC)
X[15:0]	PTC Outputs	Digital Outputs
Y[31:0]	PTC Inputs/Outputs	Analog I/O
General Purpose I/O (PORT)
PA31 - PA30 / PA28 - PA27 / PA25 - PA00	General Purpose I/O Pin in Port A	Digital I/O
PB31 - PB30 / PB25 - PB00	General Purpose I/O Pin in Port B	Digital I/O
PC28 - PC24 / PC21 - PC05 / PC03 - PC00	General Purpose I/O Pin in Port C	Digital I/O
Controller Area Network (CAN)
TX	CAN Transmit Line	Digital Output
RX	CAN Receive Line	Digital Input
Position Decoder (PDEC)
PDEC[2:0]	PDEC inputs	Digital Input
Serial Wire Debug interface
SWDIO	Serial Wire Debug Bidirectional Data	Digital I/O
SWCLK	Serial Wire Debug Clock	Digital Input

Note:

Refer to Configuration Summary and Pinout and Packaging chapters for the list of peripherals, peripheral instances, channels, and input/output pins present in each variant.